One of my hens recently had mites...which I am now treating her for. Due to scratching around her eye (because of the mites), she has a scab that has formed over her eye area. You cannot see her eye at all. Should I remove this scab or simply let it fall off? Should I place some thing on it to keep it moist and encourage it to fall off? I am just concerned that my hen only has use of one eye right now and I don't want to cause any harm to the eye that has the scab over it.